# File lib/rex/proto/ntlm/message.rb, line 80 def decode64(str) parse(Rex::Text::decode_base64(str)) end
Downgrading Type messages to LMv1/NTLMv1 and removing signing
# File lib/rex/proto/ntlm/message.rb, line 492 def self.downgrade_type_message(message) decode = Rex::Text.decode_base64(message.strip) type = decode[8,1].unpack("C").first if (type > 0 and type < 4) reqflags = decode[12..15] if (type == 1 or type == 3) reqflags = decode[20..23] if (type == 2) reqflags = reqflags.unpack("V") # Remove NEGOTIATE_NTLMV2_KEY and NEGOTIATE_ALWAYS_SIGN, this lowers the negotiation # down to LMv1/NTLMv1. if (reqflags & CONST::NEGOTIATE_NTLM2_KEY) == CONST::NEGOTIATE_NTLM2_KEY reqflags = reqflags - CONST::NEGOTIATE_NTLM2_KEY end if (reqflags & CONST::NEGOTIATE_ALWAYS_SIGN) == CONST::NEGOTIATE_ALWAYS_SIGN reqflags = reqflags - CONST::NEGOTIATE_ALWAYS_SIGN end # Return the flags back to the decode so we can base64 it again flags = reqflags.to_s(16) 0.upto(8) do |idx| if (idx > flags.length) flags.insert(0, "0") end end idx = 0 0.upto(3) do |cnt| if (type == 2) decode[23-cnt] = [flags[idx,1]].pack("C") else decode[15-cnt] = [flags[idx,1]].pack("C") end idx += 2 end end return Rex::Text.encode_base64(decode).delete("\n") # base64 encode and remove the returns end
# File lib/rex/proto/ntlm/message.rb, line 64 def parse(str) m = Type0.new m.parse(str) case m.type when 1 t = Type1.parse(str) when 2 t = Type2.parse(str) when 3 t = Type3.parse(str) else raise ArgumentError, "unknown type: #{m.type}" end t end
Process Type 1 NTLM Messages, return a Base64 Type 2 Message
# File lib/rex/proto/ntlm/message.rb, line 402 def self.process_type1_message(message, nonce = "\x11\x22\x33\x44\x55\x66\x77\x88", win_domain = 'DOMAIN', win_name = 'SERVER', dns_name = 'server', dns_domain = 'example.com', downgrade = true) dns_name = Rex::Text.to_unicode(dns_name + "." + dns_domain) win_domain = Rex::Text.to_unicode(win_domain) dns_domain = Rex::Text.to_unicode(dns_domain) win_name = Rex::Text.to_unicode(win_name) decode = Rex::Text.decode_base64(message.strip) type = decode[8,1].unpack("C").first if (type == 1) # A type 1 message has been received, lets build a type 2 message response reqflags = decode[12,4] reqflags = reqflags.unpack("V").first if (reqflags & CONST::REQUEST_TARGET) == CONST::REQUEST_TARGET if (downgrade) # At this time NTLMv2 and signing requirements are not supported if (reqflags & CONST::NEGOTIATE_NTLM2_KEY) == CONST::NEGOTIATE_NTLM2_KEY reqflags = reqflags - CONST::NEGOTIATE_NTLM2_KEY end if (reqflags & CONST::NEGOTIATE_ALWAYS_SIGN) == CONST::NEGOTIATE_ALWAYS_SIGN reqflags = reqflags - CONST::NEGOTIATE_ALWAYS_SIGN end end flags = reqflags + CONST::TARGET_TYPE_DOMAIN + CONST::TARGET_TYPE_SERVER tid = true tidoffset = 48 + win_domain.length tidbuff = [2].pack('v') + # tid type, win domain [win_domain.length].pack('v') + win_domain + [1].pack('v') + # tid type, server name [win_name.length].pack('v') + win_name + [4].pack('v') + # tid type, domain name [dns_domain.length].pack('v') + dns_domain + [3].pack('v') + # tid type, dns_name [dns_name.length].pack('v') + dns_name else flags = CONST::NEGOTIATE_UNICODE + CONST::NEGOTIATE_NTLM tid = false end type2msg = "NTLMSSP\00"" + # protocol, 8 bytes "\x02\x00\x00\x00" # type, 4 bytes if (tid) type2msg += # Target security info, 8 bytes. Filled if REQUEST_TARGET [win_domain.length].pack('v') + # Length, 2 bytes [win_domain.length].pack('v') # Allocated space, 2 bytes end type2msg +="\x30\x00\x00\x00" + # Offset, 4 bytes [flags].pack('V') + # flags, 4 bytes nonce + # the nonce, 8 bytes "\x00" * 8 # Context (all 0s), 8 bytes if (tid) type2msg += # Target information security buffer. Filled if REQUEST_TARGET [tidbuff.length].pack('v') + # Length, 2 bytes [tidbuff.length].pack('v') + # Allocated space, 2 bytes [tidoffset].pack('V') + # Offset, 4 bytes (usually \x48 + length of win_domain) win_domain + # Target name data (domain in unicode if REQUEST_UNICODE) # Target information data tidbuff + # Type, 2 bytes # Length, 2 bytes # Data (in unicode if REQUEST_UNICODE) "\x00\x00\x00\x00" # Terminator, 4 bytes, all \x00 end type2msg = Rex::Text.encode_base64(type2msg).delete("\n") # base64 encode and remove the returns else # This is not a Type2 message type2msg = "" end return type2msg end
Process Type 3 NTLM Message (in Base64)
from www.innovation.ch/personal/ronald/ntlm.html
struct { byte protocol[8]; // 'N', 'T', 'L', 'M', 'S', 'S', 'P', '\0' byte type; // 0x03 byte zero[3]; short lm_resp_len; // LanManager response length (always 0x18) short lm_resp_len; // LanManager response length (always 0x18) short lm_resp_off; // LanManager response offset byte zero[2]; short nt_resp_len; // NT response length (always 0x18) short nt_resp_len; // NT response length (always 0x18) short nt_resp_off; // NT response offset byte zero[2]; short dom_len; // domain string length short dom_len; // domain string length short dom_off; // domain string offset (always 0x40) byte zero[2]; short user_len; // username string length short user_len; // username string length short user_off; // username string offset byte zero[2]; short host_len; // host string length short host_len; // host string length short host_off; // host string offset byte zero[6]; short msg_len; // message length byte zero[2]; short flags; // 0x8201 byte zero[2]; byte dom[*]; // domain string (unicode UTF-16LE) byte user[*]; // username string (unicode UTF-16LE) byte host[*]; // host string (unicode UTF-16LE) byte lm_resp[*]; // LanManager response byte nt_resp[*]; // NT response } type_3_message
# File lib/rex/proto/ntlm/message.rb, line 367 def self.process_type3_message(message) decode = Rex::Text.decode_base64(message.strip) type = decode[8,1].unpack("C").first if (type == 3) lm_len = decode[12,2].unpack("v").first lm_offset = decode[16,2].unpack("v").first lm = decode[lm_offset, lm_len].unpack("H*").first nt_len = decode[20,2].unpack("v").first nt_offset = decode[24,2].unpack("v").first nt = decode[nt_offset, nt_len].unpack("H*").first dom_len = decode[28,2].unpack("v").first dom_offset = decode[32,2].unpack("v").first domain = decode[dom_offset, dom_len] user_len = decode[36,2].unpack("v").first user_offset = decode[40,2].unpack("v").first user = decode[user_offset, user_len] host_len = decode[44,2].unpack("v").first host_offset = decode[48,2].unpack("v").first host = decode[host_offset, host_len] return domain, user, host, lm, nt else return "", "", "", "", "" end end
# File lib/rex/proto/ntlm/message.rb, line 112 def data_size security_buffers.inject(0){|sum, a| sum += a[1].data_size} end
# File lib/rex/proto/ntlm/message.rb, line 106 def decode64(str) parse(Rex::Text::decode_base64(str)) end
# File lib/rex/proto/ntlm/message.rb, line 93 def dump_flags CONST::FLAG_KEYS.each{ |k| print(k, "=", flag?(k), "\n") } end
# File lib/rex/proto/ntlm/message.rb, line 102 def encode64 Rex::Text::encode_base64(serialize) end
# File lib/rex/proto/ntlm/message.rb, line 85 def has_flag?(flag) (self[:flag].value & CONST::FLAGS[flag]) == CONST::FLAGS[flag] end
# File lib/rex/proto/ntlm/message.rb, line 97 def serialize deflag super + security_buffers.map{|n, f| f.value}.join end
# File lib/rex/proto/ntlm/message.rb, line 89 def set_flag(flag) self[:flag].value |= CONST::FLAGS[flag] end
# File lib/rex/proto/ntlm/message.rb, line 116 def size head_size + data_size end
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